Pulley.



. which is adapted to be fixed with relation cARLVM. swANsoN, orjnrsMonvEs, iowA.

PULLEY.

p Application filed yJanuary 17, 1908. Serial No. 411,358.

' specicatonofnetters Patent.

Patented Nov. 24, 190s.

To allpwhom 'it may concern; l Y v Be it known that I, GARLM.. SWANsoN',a citizen of the United States, residing at Des Moines, in the countyofPolk and Stateof Iowa, have invented new and useful Improvements inPulleys, of which the following is a specication. p l The inventionrelates to an improvement in pulleys, and is particularly directed to aloose pulley in the construction of which provision is made for a`continual and automaticlubrication of thepulley for an eX- tendedperiod.

The main object of the present invention is the provision of a loosepulley made'up of two sections, one of whichfis` fixed with' relation tothe shaft vand the other movable with relation thereto,each` of saidsections being formed with lubricant receiving chambers, one of whichisformed' inA the rela-` tively liXed section and the other in themovable section, the former being adapted for semi-solidy lubricantsWhile the latter is adapted for fluid lubricants. The invention in thepreferred form of details will be described in the followingspecification, reference beinghad to the accompanying drawings in which:i

Figure 1 is a longitudinal central sectional view through my improvedpulley, the shaft being shown in elevation. Fig. 2 is an end elevationof the pulley with the shaft in section. Y Fig. 3 isa transverse sectionof the pulley on the line 3-3 of Fig. 1.

Referring particularly to the accompanying drawings my improved pulleyis made up of two sections 1 and 2, the vformer of to the shaft 3 onwhich the pulley is mounted, and may be hereinafter termed the` fixedsection, while the latter is loosely mounted on section 1 and will behereinafter `termed the loose or belt section. Y

The Xed section is in the formof an. elongated sleeve-like member formedwith a central bore 4 for the reception of the shaft 3, a set screw 5passing through the wallof the sleeve and engaging the shaft to iiX the4section 1 with relation to the shaft. The peripheral surface of thesection 1 tapers from one end toward the other, being formed at thelarger end with anannular oifset6 forming an abrupt shoulder 7. "Withinthe section 1 is formed an annular lubricant chamber 8, preferably ofelongated shape and arranged wholly within the body of the sectionbetween its peripheral surface and the bore l. This chamber is incommunication with the peripheral surface of the section by a series ofradially disposed openings 9, so that lubricant in the chamber 8 mayfind its way to the peripheral or bearing' surface of the section. Thechamber f 8 which terminates at one end remote vfrom the end of thesection is in communication with said endthrough the medium of channels10, through which the lubricant may be forced into the chamber.

The belt section is mainly in the form of an ordinary pulley comprisinga hub 11 and a beltreceiving sleeve or surface 12, the hub and sleeve 12being connected by an annular centrally disposed web 13. The interiorsurface of the hub 11 corresponds in taper and diameter tothe exteriordimensions of the section 1, said hubbeing cut away at one end as at 14to engage the shoulder 7 and the annular 0E set 6. At the opposite endthe hub which is extended beyond the proximate end of the section 1'isformed with an annular recess 15 designed to receive a screw disk 16,the inner surface of which is designed to bear squarely against theproximate Vend of the section 1 and to be removably` secured theretothrough the medium of screws 17, whereby the belt section and fixed`section .are held against relatively longitudinal movement while beingpermitted free independent revoluble movement. The lubricant channels 10in the fixed section are accessible from the end of the pulley throughcommunicating apertures 18 formed in the disk 16, and registering withchannels 10 when the disk is in applied position, filling screws 19normally closing these entrance openings.

\ Adjacent the hub 11 the web 13 is materially thickened and formed insaid thickened. portion with an annular chamber 20, forming a lubricantchamber which is in communication with the interior surface of the beltsection through the medium of apertures 21, in which is preferablymounted a series of wicks or other capillary distributers.

In the use of the pulley with a comparatively `solid lubricant asgrease, the chamber 8 in the fixed section 1 is charged with suchlubricant through the channels 10, While in the use of a Huid lubricantas oil the chamber 20in the belt section is used. In the latter eventthe chamber 8 in the xed section is closely packed with an absorbent aswaste and the like, preventing the lubricant from finding its way freelyinto the channel and yet permitting the waste to receive and absorbsufficient of said lubricant to assist in the lubrication of the parts.

It is to be particularly noted that the hub of the pulley extends aslight distance beyond the proximate edge of the fixed section. By thisconstruction the oil and grease finding its way between the sections isprevented from coming in contact with or dripping upon the belt. Byvirtue of the taper of section l kthe hub of the pulley will not wear inthe shifting operation of the belt from the tight pulley to the loosepulley, as such operation tends to force the belt section or section 2of the loose pulley on to the comparatively larger portion of the fixedsection or sleeve l, thereby taking up all lost motion between therespective sections at the particular time when the moving section issubjected to extreme strain.

The pulley described is of comparatively simple construction, the partsbeing so arranged as to permit their ready disconnection when desiredfor repair or renewal, and the use of the combined oil chamberspermitting an extended and appropriate operation of the parts with asingle lubrication.

Having thus described the invention what I claim is l. A pulley made upin two sections, a fixed section to be secured to the shaft and a beltsection to revolve upon the xed section, the bearing surfaces of therespective sections tapering from one end to the other, the fixedsection comprising a solid body encircling the shaft, said body beingformed with an elongated chamber arranged wholly within the body of thesection and communicating with a channel formed in an opening throughone end of the body of the section, the belt section being formed withan annular chamber disposed around the chamber in the ixed section, andmeans for establishing communication between the elongated chamber andannular chamber.

2. A pulley made up in two sections, a fixed section to be secured tothe shaft and a belt section to revolve upon the iixed section, thebearing surfaces of the respective sections tapering from one end to theother, the lixed section comprising a solid body encircling the shaft,said body being formed with an enlarged chamber arranged wholly withinthe body of the section and communicating with a channel formed in anopening through one end of the body of the scction, the belt sectionbeing formed with an annular chamber disposed around the chamber in thefixed section, means for establishing communication between therespective chambers, and a disk adapted to be secured to the fixedsection and engage the belt scction to prevent independent longitudinalmovement of the latter, said disk being formed with an opening toregister with the channel in the fixed section.

In testimony whereof I affix my signature in presence of two witnesses.

CARL M. SVVANSON.

Witnesses T. J. CAssELL, A. B. SIMS.

